As well as the above answers;
Most airlines of this size have an almost instant radio link to their maintenance and/or operations centers whenever an occasion/delay like the first snag happens, and the controllers would have a clear record of what happened at the last turn-back, or return to Stand.
Maintrol should have had some form of grip/involvement on the first 'snag' and how long it would take to repair it, as they would contribute to a decision to fix or replace the aircraft or whether to disembark the pax for the repair.
Finally, a copy of the sector record should/may have been faxed/sent to the operations/maintenance control as the aircraft left the Stand - though busy line engineers often leave this until later.